During a segment on "Morning Joe," the MSNBC co-host tore into the president and Republicans, saying Trump was on track to oust President Buchanan as historians' agreed-upon worst president.

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"Some of you may know, I left the Republican Party," Scarborough said Wednesday. "Less over Donald Trump than over the fact that every elected official in the GOP has bowed and scraped at Donald Trump, treating this man whose skills are objectively declining on a daily basis, they treated this man like an emperor wearing the finest clothes ever made."

"When in fact, objectively, Donald Trump is on track to be the worst president in modern times, and perhaps ever," Scarborough continued. "Pushing even James Buchanan off of that dubious perch."

Scarborough and his "Morning Joe" co-host and wife, Mika Brzezinski, are frequent critics of the president, often sparring with the president over the course of the 2016 campaign and during his time in the White House.

Earlier this year, Scarborough slammed his former Republican colleagues for ignoring what he called warning signs about the president's positive view of China's ruling system, in which the nation removed term limits earlier this year allowing for a president to remain in the position for life.

“There are many people who will say, 'Oh, the president was just joking.' I could give you a list of a thousand things where they claimed the president was joking afterwards,” Scarborough said after Trump joked about the U.S. dropping term limits at the time.

“When Republicans ignore the fact that this man is talking about being president for life, if they think that Donald Trump is joking, then they’re fools,” Scarborough added. “And I don’t think they’re fools. I think they know exactly what he’s saying.”